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中四Math .....一問
2007-10-11 6:28 am
回答 (1)
2007-10-11 7:00 am
✔ 最佳答案
a)y = x^2 + bx + c-12 = 0^2 + b ( 0 ) + c [ Sub ( 0, - 12 )]
c = -12
So,
y = x^2 + bx - 12
0 = ( - 4 )^2 + b ( - 4 ) - 12 [ Sub ( -4 , 0 )]
4b = 4
b = 1
b) y = x^2 + x - 12
0 = x^2 + x - 12
( x + 4 )( x - 3 ) = 0
x = -4 or 3
So P ( 3 , 0 ).
參考: My Maths Knowledge
收錄日期: 2021-04-13 19:21:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071010000051KK04320